freight traffic source

例句：

1. 1.The freight traffic source is the main factor affecting the efficiency of cargo transportation.
   货运交通来源是影响货物运输效率的主要因素。
2. 2.The freight traffic source plays a crucial role in the development of the logistics industry.
   货运交通来源在物流行业的发展中起着至关重要的作用。
3. 3. To improve the efficiency of freight traffic, we need to optimize the freight traffic source.
   为了提高货运效率，我们需要优化货运交通源。